Machine for counterboring and tapping nuts



(No Model.) l S'Sheets-Sheet 1. J. GIELOW.

MACHINE POR GOUNTERBORING AND TAPPING NUTS. No. 376,408, Patented Jan. l0, 1888.

(No Model.) 3 Sheets-Sheet 2.

. J. GIELQW.

, MACHINE FON-'CIOUNTENBORING AND TAPPING NUTS. No. 376.408.

'Patented Jan. 10, 1888.

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(No Model.) 3 Smets-sheet 3. 4 J. GIELOW.

MACHINE FOR GOUNTERBORING ANI) 'I'APPING NUTS. No. 376,408. Patented Jan. 10, 188,8.

it was withdrawn. g

or facing is done by hand, the operator accom- UNITED STATES PATENT Orrin-r3.

'JOHN GILOW, OF CHICAGO, ILLINOIS.

MACHINE FOR COUNTERBORING AND TAPPING NUTS.

SPECIFICATION forming part of Letters Patent N. 376.408aatee January 10,1888.

V i Application filed July, i887. Serial No. 243,366. (No model.)

To all whom z' may concern:

Be it known that l, JOHN GIELow, a citizeny of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Machines for Tapping and .Counterboring, of which the following is a specification.

My invention relates to machines for tapping and counterboring, or boring and facing nuts and other articles.

In order to leave the end or face of the nut or other article smooth, it is essential that the counterboring o r facing tool should make one or more revolutions after it ceases to feed for.- ward and before it begins to recede, or that it make several revolutions while feeding very slowly or slightly at the completion ofthe nut, otherwise the face of the nut will be leftrough or notched tothe extent of the thick ness of the chip being cut by the facing-tool at the time Where the counterboring plishes thedesired result by gradually diminishing the pressure he exerts upon the boringtool as the operation nears completion.

It is the object of my invention to provide an automatic machine of a simple and efficient construction for counterboring or facing nuts and like articles and simultaneously tapping ing furnished with a spring or yielding device to permit the feed movement to continue for a short period after the stop is reached, and thus press or hold the revolving tool agains-t its work for a few revolutions after its forward feed Vis arrested by the feedstop.

It further consists, in connection with such Y automatic boringand facing tool or device, of a revoluble table or frame furnished with a series of clutches or clamps and a tappingtool 5o operating simultaneously to tap or thread one nut while the counterboring-tool is preparing another nut for the threading operation.

It further consists in the peculiar feed and stop mechanism I employ for operating the counterboring-tool.

It also consists in the novel devices and novel combination of parts or devices herein shown and described', and more particularly pointed out in the claims.

- In the accompanying drawi11gs,whiel1 form a part of this specification, and in which similar letters of reference indicate like parts, Figure l is a plan view of a machine embodying my invention. Fig. 2 is a sectional view on line 2 2 of Fig. 1, showing in elevation the counterboring mechanism. Fig. 3 is a similar view,looking from line 3 3,0f Fig. 1, and showing the tapping or threading device. Fig. 4 is an enlarged detail view'fof thefeed mechanism for the counterboring-tool. Fig. 5 is a section on line 5 5 of Fig. 4. Fig. 6 is a section on line 6 6 ofvFig. 4. Fig. 7' is a section on line 7 7 of Fig. 4.V Fig. 8 is a `detail view showing the clutch or stop for holding the chuck-table in place and registering the nut- Fig. 9 is a-diagram or view illustrating the operating lever or treadle and its connections. Fig. 10 is a longitudinal section of the sleeve and adjustable stop-collar on the boring-tool spindle. Fig. 11 is a cross-section on line 1l of Fig. 10, and Fig. 12 is a section on line 12 12 of Fig. 4.

In said drawings, A represents theframe of the machine; B, a revolving table or frame carrying the chucks or clamps B B B for holding they nuts or articles to be counterbored and tapped. The chucks B are of an ordinary and well-known construction. The rotatable table or frame B is registered and held in place by aclutch-lever, b, that engages suitable recesses in the periphery of the table.

Cis the counterboring-tool,having the usual shoulder for smoothing the end or face of the nut.

C' is the reciprocating spindle on which the tool is mounted; C2, the bearings or guides in which it reciprocates, and Ca the hollow shaft to which it is suitably splined and by which it is revolved. The hollow shaft C3 is driven by IOO . 75 holder chucks or clamps with the tools; and

a bevel-gear, C, thereon, which meshes with a bevel-gear, G5, on the driving-shaft Cf.

CT is the driving-pulley. The spindle C is furnished with a stop, c, consisting, preferably, of a collar or other suitable projection carried by the spindle, tolimit theforward ordownward feed of the counterboringtool. This stop or collar c is` or should be, made adjustable on the spindle. It is preferably secured to the non-rotarysleeve c', which is fixed longitudinally on the spindle C by the threaded rings 01 jam-nuts c ci". The stop collar or rim c is furnished with screwthreads, and turns upon the threaded shoulder of the adjustable collar c. rlhe collar c4 is adjustably secured to the sleeve c' by the setscrew c, and the stop-ring c is further provided with a setvscrew, c6. rlhe stop c strikes against the lower box or bearing, C2, which is fixed to the frame of the machine, and thus arrests the forward or downward feed ofthe boring-tool. The sleeve c is provided with arack, ci, for feedingthe spindle G down.

A gear, D, on the feedshaft D meshes with the feed-rack c7. The gear D is keyed to the shaft D', and the shaft D'is also furnished with a hub, D2, also keyed rigidly thereto, upon which hub is mounted a loose gear-wheel, D, the teeth of which mesh with aworm, D". The loose gear D is connected to the gear D, or, rather, to the fixed hub D, by means of a spring, D, so that the feed-wheel D may be arrested while the gear D3 continues slightly to revolve. A pin or projection, d, on the wheel D, fitting in a slot or recess, d', in the hub D?, limits the extent of this yielding or Spring movement of the gear D after the motion of the feed-wheel D is arrested. The shaft F of the worm Dl isjournaled in movable bearings F FZ, the bearing F' being pivoted atf to the frame, and the bearing F reciprocating up and down in a dovetail frame or slideway, F, which is likewise pivotally connected to the frame of the machine atf. Tile sliding bearing Fi is operated by means of a lever or treadle, G, and suitable connecting cords, pulleys, and levers, as g g y g, to move the worm in contact with the gear D, and thus feed the boring-tool down against the nut. The wheel D3 is furnished with an annular groove, di, in which fits an adjustable segment, d, havinga curved end or projection, d, by which the pawl 7L is operated to release the slide F2, and thus disengage the worm D4 from the gear D, Vhen the worm is moved into contact with the gear, as shown in Fig. 4, the pawl h. en-

gages a notch-or projection, h, on the sliding bearing F2, and thus holds the worln in engagement with the wheel until the wheel revolves far enough to cause the tripper device or projection d to strike the pawl h and disengage it from the slide Ft', when said slide will drop, and thus discngage the worm D'1 from the gear D". The pawl h is provided with a spring, h, to hold it in place. The segment d is ad j ustabl y secured in the wheel D5 by a clamp-screw, d.

By adjusting the position of the paw1tripping device d* on the wheel D3 the tool C may be i'ed down a greater or less extent before the pawl is disengaged from the slide F". The pin or projection d is also adjustably secured in the groove dZ of the wheel D, so that the tension ofthe spring D5 may be regulated, as required from time to time.

The shaft l" is driven from the shaft C by pulleys Cs C and belt Cm. A weight, E, connected to the spindle C' by a liuc, E', passing over a pulley, E2, serves to retract the spindle the moment the worin D is disengaged from the wheel D", so that the shaft D may revolve freely in the opposite direction as the rack c7 moves upward or back. v

The tapping-tool K is mounted upon a sliding shaft or spindle,K, having the usual screwthreads, K2, to feed it forward, and journaled in suitable bearings, K, in the frame A. The spindle K is revolved in opposite directions by the driving and reversing gears K4 K5, loosely journaled thereon, which mesh with a bevel-gear, K, on the shaft K7.

K5 is the driving-pulley.

The shaft K is furnished with a sliding double clutch, k, secured from rotation on said shaft by a spline or other suitable means, which alternately engages the clutch-faces k and le of the driving and reversing gears Ki The clutch k is operated by a lever, k. The lever It carries a pivotal block or bearing, k, through which passes a sliding rod, ki', having fixed collars or shoulders k lcT and a coil-spring, k. The block lo* has a notch or projection, It, which engages the pawl kl. The rod kis pivoted to an arm, 7s, carried 011 a loose collar, k, on the shalt K. A guide, k, keeps the arm la in place. llhe clutch-lever k3 is operated to throw the clutch k into engagement with the driving-gear K4 by means of the operating-le\f'er G and the line g4 and pulley g5, connected with said lever by the lever g'z and link gf. The tapping and counterboring tools are thus made to operate simultaneously. When the clutch k is thus thrown into engagement with the drivinggear K, it is so held by the pawl km engaging the block k on the lever L3, until the longitudinal movement of the spindle K causes the collar or projection It on the rod la to strike the end of the pawl k1, and thus release the clutch-lever, when the spring k8 will throw the clutch k into engagement with the clutch-face ofthe reversinggear K5. As the feed screw K2 causes the spindle K to travel back, the collar k7 will strike against the block k* and move the clutch k out of engagement with the reversing-gear, after the tool K has been Unthreaded from its work. This mechanism for automatically reversing the motion of the threading-tool and stopping the same forms part of another application filed by me of even date herewith, and is not herein claimed. In this machine I prefer to employ this mechanism for automatically operating the tapping or threading tool.

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However, other suitable equivalent means or substitutevmechanism may be employed for this purpose. f

The spring Dior other suitable yielding de-v devised, my invention, in its broader features,

is not confined thereto, but other suitable equivalent or substitute devices may be used.

In operation, while a nut or article-is being placed by the operator in one ofthe three chucks B on the table B the counterboringtool Gis boring and facing the nutin the second chuck, and the tapping-tool threading the nut in the thirdrchuck.

I claim- .l l. The combination,` with a rotatable table or frame having chucks or clamps mounted thereon, of a revolving eounterboring-tool, a stop to limit its forward feed, and automatic mechanism for feeding the same provided with a spring or yielding device connecting the same with the tool and adapted to keep the tool pressed against its work after its forward motion has been arrested by said stop, and thus to permit such counterboring-tool to make one or more revolutions in contact with its work-after its forward feed has been arrested, a tapping-tool, and lnechanism for operating said tappingtoolsimultaneously with saidk counterboring-tool, substantially as specified.

2. The combination, with a suitable chuck or work-holder, of a counterboringtool furnished with a stop to limit lits forward feed, and automatic means for feeding'said counterboring-tool provided with a spring or yielding device through which the feed motion is communicated to said tool to permit such tool to revolve in contact with its work after its forward feed has been arrested, substantially as specified. p

3. The combination, with a chuck or work- Yholder, of a counterboring-tool mounted on a revolving spindle furnished with an adjustable stop or collar, a feed-rack and feed-Wheel, a wheel for driving such feed-wheel, and a spring connection between the two, substan-v shaft, a stop to limit its forward feed, a feedrack, feed wheel and shaft, and driving-wheel loosely journaled on said feed-shaft, a spring connecting said driving-wheel and feed-wheel, anda movable worm journaled at one end in la pivotal bearingand at the other in a sliding bearing mounted on a pivotal guide, substantially as specified.

6. The combination, with a chuck or workholder, of a revolving tool-carrying spindle or shaft, a stop to limit its forward feed, a feedrack, feed wheel and shaft, and a drivingwheel loosely journaled on said feed-shaft, a spring connecting said driving-wheel and feedwheel, a movable worm journaled at one end in a pivotal bearing and at the other in a sliding bearing mounted on a pivotal guide, and a pawl engaging said sliding bearing for holding said worm in contact with said drivingwheel, substantially as specified.

7-. The combination, with a chuck or workholder, of a revolving tool-carrying spindle or shaft, a stop to limit its forward feed, a feedrack, feed Wheel and shaft, and a drivingwheel loosely journaled on-` said feed-shaft, aspring connecting said driving-wheel and feedling tool, K, mounted on a revolving spindle,

K', mechanism, substantially as described,for driving, reversing, and stopping said spindle, a counterboring-tool, as C, carried on a revolving spindle, C', a stop to limit its forward feed, and feed mechanism furnished with a spring or yielding device, through which the feed motion is communicated to said tool, Ito per- .mit said counterboring-tool to revolve in contact with its work after its forward feed is arrested by said stop, an operating-lever, as G, and suitable connecting mechanism for putting both said tools in operation simultaneously, substantially as specified.

9. The combination, with a revolving reciprocating tool-carrying spindle, of a feed rack and wheel, and a movable worm for operating said feed-wheel, having a pivotal bearing, F", at one end and a sliding bearing, F2, at the other, mounted on a pivotal guide, F3, substantially as specified.

10. The combination, with a revolving reciprocating tool-carrying spindle, of afeed rack and wheel, and a movable worm for operating said feed-wheel, having a pivotal bearing, F',

`at one end and a sliding bearing, F2, at the l1older,of a revolving reciprocating tool-carry :L feed-Wheel :md feed-rack, a feed-Wheel shaft, Io

ing spindle7 as C, having o stop, as c, and L as D', o gear thereon` as D3, furnished with an feed-mok, as ci, :L feed-wheel, D, foed-wheel annular channel, di, segmental ring d, having shaft D', loose driving-wheel, as D, a spring, projection d", and a pawl, h, substantially as as D5, and :L pin or projection, as d, on said speeilied.

wheel D, to limit its movement in respect to said feed-wheel D, substantially as speeiledn Witnesses:

12. The combination, with n revolving re- WILLIAM B. CLIFFORD,

eiproeating tool-carrying spindle, as C, with H. XV. MUNDAY.

JOHN GIELOW'. 

